S-80834CNPF-B8TTFU

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Power management integrated circuit (PMIC) is a kind of controllers for managing the power supply for microprocessor, microcontroller and analog circuits. PMICs offer a wide range of products, ranging from simple voltage ranges to complex power converters, which are tailored for specific applications. PMICs typically shown in commercial applications include factory basic production, telecommunication, computer and personal electronics. Among PMICs, supervisors are designed to monitor microprocessor power and system signals. Supervisors are produced in both analog and digital form, with the advent of digital supervisors the power and cost efficiency of such circuits has been greatly improved. The S-80834CNPF-B8TTFU is an example of digital supervisors and in this article, the application field and working principle of the S-80834CNPF-B8TTFU will be discussed.

The S-80834CNPF-B8TTFU is designed to protect the microprocessor from supply voltage, reset output and power on/off abnormality of the power supply, making it ideal for microprocessor-based applications. It is designed to monitor single, dual power supply operating voltages and has a power-on reset (POR) output to reset the microcontroller when the power is turned on. It is also capable of changing the reset output voltage depending on the output voltage pin. The S-80834CNPF-B8TTFU is a three terminal digital supervisor and provides a wide operating voltage range from 1.5V to 5.5V. The operating supply voltage, reset output voltage and setup is optimized for providing the system with reset function in different supply voltage conditions.

The application field of the S-80834CNPF-B8TTFU includes embedded systems such as digital meters, industrial controllers, home appliance such as air conditioners, washing machines and microwave ovens, and personal electronic products such as smart phones and digital cameras. The S-80834CNPF-B8TTFU is designed to prevent system malfunction under various supply voltage conditions and input voltage transients due to power interruption or high output current. In this way, the S-80834CNPF-B8TTFU ensures high reliability of the system and prevents the system from restarting and continues to reset when the power supply voltage is restored.

The working principle of the S-80834CNPF-B8TTFU is based on the principle of power-on reset (POR). It provides an adjustable delay time from the input voltage to the reset output voltage. During the reset period, the POR circuit will ensure the reset output is asserted to reset the microcontroller or other system elements. The POR circuit is driven by a digital input which detects the power-off status. When the power is turned off, the reset output of the POR circuit will be asserted and remain asserted until the input power supply reaches a preset voltage. When the power is restored, the reset signal will be negated. The delay time of the POR circuit can be adjusted via an external capacitor.

The S-80834CNPF-B8TTFU also provides a Watchdog system which will reset the microcontroller if the watchdog timer is not cleared periodically. The watchdog system is enabled by using a digital input which is used to set the watchdog expect time. When the watchdog timer reaches its predefined time, the reset output will be asserted until the timer is cleared. The watchdog timer value can be changed by changing the external RC resistor or capacitor.

In conclusion, the S-80834CNPF-B8TTFU is a digital supervisor designed to protect the microprocessor from supply voltage, reset output and power on/off abnormality of the power supply. It is suitable for embedded systems, home appliances, digital meters, industrial controllers and personal electronic products. It is driven by a power-on reset (POR) circuit, which provides an adjustable delay time and a watchdog timer to reset the microcontroller if the timer is not cleared periodically. The POR circuit and watchdog timer can be adjusted via external RC resistor/capacitor.

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